We agree we nothing, or not enough, about these future projects, but we are here talking because we like to share our ideas, theories and speculations. I also like to tell my crazy suggestions.
The first step for the return of Dragonlance will be the remade of the modules, but nothing about the 5th age will be told.
Ravenloft will come back, I warn we may see retcon about some details, or even a almost reboot. Maybe Azalin send more time-travelers to stop their previous agents and now the grand conjunction has got some different effects.
Ravenloft will be like mixing Silent Hill, other indie survival horror videogames and Game of Thrones.
Also we will see alliances with some dark lords against the main menace, Gwydion, darklord of the shadow rift, or against (infiltrated secret) agents of elder-brain of Bluespur. And some new domains, with abducted people from Eberron, but also from Innistrad.
Some ideas by authors from DM Guild could become canon, but we have to take care, if we don't want the lands of the mists become a Jurassic Park for undeads and gothic monsters.
(I hope these pictures help you as source of inspiration for your own stories).